Load cell and RPM counter

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Load cell and RPM counter

Postby Lysheim » Fri Jul 19, 2013 9:50 am

Hi, im currently planing a project and need som help to get started.
What i want to do is to get a live feed of the RPM of an axle, and at the same time ha a live feed of a load cell. I want the load cell to show in K(ilo)G(grams).
I also wonder how i can count the RPMs and show them.

I have read a little, and i think i can use this with [url]http://www.ebay.com/itm/S-Type-Load-Cell-Hanging-Scale-3K-/261247138167?pt=LH_DefaultDomain_0&hash=item3cd38af977]this load cell, since what i want to weight is heavyer than 200lb[/url]

Here is a picture that explain a little better:

The max should show the highest value the box to the left have been.

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Re: Load cell and RPM counter

Postby mparadis » Fri Jul 19, 2013 12:10 pm

The most accurate way to measure the RPM is to attach an encoder to the shaft using a shaft coupler. The encoder can be read by an encoder interface. If you aren't able to attach anything to the shaft, or if it's too big, you could count rotations by using a sensor and by putting something on the surface of the rotating object (for example, putting a magnet on the surface and having a magnetic sensor nearby). This method is a lot less accurate and depending on how fast you expect the shaft to rotate, it may be hard to get good results.

As for the load cell you linked, it'd be hard to tell whether it is compatible with the 1046 without seeing a data sheet. But at a glance, this load cell seems to be rated for 3K, which is a lot less than 200 lbs.

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